/* 左侧 logo + 导航 */
#aside {
  width: 20%;
  position: fixed;
  bottom: 0;
  top: 0;
  left: 0;
  overflow-y: scroll;
  z-index: 1001;
  -webkit-transition: 0.5s;
  -o-transition: 0.5s;
  transition: 0.5s;
  padding: 60px 20px 40px 20px;
  box-sizing: border-box;
}

/* 左侧 logo */
#aside .logo {
  text-align: center;
  font-family: Arial, sans-serif;
  font-weight: 700;
  margin-bottom: 2em;
  text-transform: uppercase;
  font-size: 40px;
}
#aside .logo a {
  color: #000;
  text-decoration: none;
}
#aside .logo a:hover {
  color: #228896;
}

/* 左侧导航 */
#aside .nav-menu ul {
  text-align: center;
  margin: 0;
  padding: 32px 0 2px;
  background-color: #fff;
  border-radius: 10px;
  /* border: 1px solid blue; */
  box-sizing: border-box;
}
#aside .nav-menu ul li {
  margin: 0 0 40px 0;
  padding: 0;
  list-style: none;
}
#aside .nav-menu ul li a {
  color: rgba(0, 0, 0, 0.9);
  text-decoration: none;
  text-transform: uppercase;
  font-size: 16px;
  font-weight: 500;
  position: relative;
  padding: 10px 10px;
  letter-spacing: 0.2em;
  font-family: Arial, sans-serif;
  -webkit-transition: 0.3s;
  -o-transition: 0.3s;
  transition: 0.3s;
}
#aside .nav-menu ul li a:after {
  content: "";
  position: absolute;
  height: 2px;
  bottom: 4px;
  left: 10px;
  right: 10px;
  background-color: #228896;
  visibility: hidden;
  -webkit-transform: scaleX(0);
  -moz-transform: scaleX(0);
  -ms-transform: scaleX(0);
  -o-transform: scaleX(0);
  transform: scaleX(0);
  -webkit-transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  -moz-transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  -ms-transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  -o-transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
#aside .nav-menu ul li a:hover {
  text-decoration: none;
  color: #228896;
}
/* 默认a标签高亮显示样式 */
#aside .nav-menu ul li a:hover:after {
  visibility: visible;
  -webkit-transform: scaleX(1);
  -moz-transform: scaleX(1);
  -ms-transform: scaleX(1);
  -o-transform: scaleX(1);
  transform: scaleX(1);
}
#aside .nav-menu ul li a.active {
  color: #228896;
}
#aside .nav-menu ul li a.active:after {
  visibility: visible;
  -webkit-transform: scaleX(1);
  -moz-transform: scaleX(1);
  -ms-transform: scaleX(1);
  -o-transform: scaleX(1);
  transform: scaleX(1);
}

/* 右侧主体内容 */
.main {
  width: 80%;
  float: right;
  -webkit-transition: 0.5s;
  -o-transition: 0.5s;
  transition: 0.5s;
}
